Dr. Jeff Masters' WunderBlog

Tropical Storm Erika likely soon; a weaker Jimena powers towards Baja
Posted by: Dr. Jeff Masters, 07:48 PM GMT del 01 Settembre 2009 +3
Hurricane Jimena has weakened to a low-end Category 4 hurricane with 135 mph winds, thanks to the collapse of its inner eyewall. The hurricane is undergoing a process common in intense hurricanes called an Eyewall Replacement Cycle (ERC), where the eye shrinks to a size too small to be stable, resulting in the disintegration of the eyewall, and the formation of a new eyewall from one of the outer spiral bands. Once the new eyewall becomes stable tonight, Jimena has an opportunity to re-strengthen.

The latest set of 12Z model runs show little change in Jimena's track. The hurricane is still expected to make landfall Wednesday along Mexico's Baja Peninsula. If the hurricane makes landfall over the southern portion of Baja, it would likely be at major hurricane strength. However, SSTs cool quickly to 23°C at the middle of the Baja Peninsula, and Jimena would likely weaken to a Category 2 or 1 hurricane if it makes a strike towards the middle of Baja. The computer models are split on what might happen once Jimena makes landfall on Baja, with one camp predicting a northeast turn bringing the storm over Mainland Mexico and eventually into Arizona, and the other camp stalling Jimena out over or just west of Baja. Regardless, the main threat from Jimena will be flooding and mudslides due to heavy rains.

Baja's hurricane history
The most powerful hurricane on record to hit the west coast of Baja occurred last year, when Hurricane Norbert made landfall on the central Baja coast with sustained winds of 105 mph (Category 2) . Norbert's central pressure of 956 mb at landfall made it the 3rd strongest hurricane to hit the Pacific coast of Mexico since record keeping began in 1949. Norbert killed eight, knocked out power to 20,000 homes, and damaged or destroyed 40% of the homes on the islands of Margarita and Magdalena. Norbert crossed the Baja Peninsula and made landfall on Mainland Mexico as a Category 1 hurricane with 85 mph winds.

Only two major hurricanes have made landfall on Baja since record keeping began in 1949. Both hurricanes hit the east (Gulf of California) side of Baja. The first was Hurricane Olivia of 1967. Olivia made landfall on October 13, 1967 as a Category 3 hurricane with 125 mph winds. Due to its small size and the unpopulated region of coast it hit, damage was minimal. The second major hurricane was Hurricane Kiko, which made landfall on August 27, 1989, as a Category 3 hurricane with winds of 115 mph (minimal Category 3). Kiko was a small hurricane and hit a relatively unpopulated area, resulting in no loss of life and only scattered reports of damage.


Figure 1. A plot of all the major hurricanes to pass within 200 miles of Mexico's Baja Peninsula since 1949. Image credit: NOAA Coastal Services Center.

Invest 94L almost Tropical Storm Erika
The Air Force Hurricane Hunters are investigating tropical wave 94L, about 200 miles east of the Lesser Antilles Islands. So far this afternoon, they have found a broad circulation with top winds of 45 - 50 mph in heavy thunderstorms on the east side. The circulation may be too broad for 94L to be considered a tropical storm, but visible satellite imagery shows that the circulation is getting better defined, and 94L's heavy thunderstorms are moving closer to the center of circulation. Recent satellite wind shear analyses by NOAA/Colorado State University and the University of Wisconsin show that wind shear is a moderate 10 - 20 knots over 94L, and this shear is keeping any thunderstorms from developing on the system's west side.

The forecast for 94L
The latest of 12Z model runs are more in tune with the idea that 94L will become a tropical storm, with the latest ECMWF run now on board. The storm will be steered west-northwest to northwest over the next three days thanks to the presence to two upper-level lows to the northwest of the storm. Since most of 94L's heavy thunderstorms and high winds are on the east side, the northern Lesser Antilles and Puerto Rico will probably be spared tropical storm force winds from this system. The best guess track for 94L, assuming it does intensify into a tropical storm in the next 24 hours, is on a northwest path between the Bahamas and Bermuda. If 94L stays weak, a more southerly path, along the northern edge of the Bahama Islands, is more likely.


Figure 2. Infrared satellite image taken at 12pm EDT, Tuesday Sep 1, 2009. Five major African tropical waves are apparent. Image credit: Navy Research Lab, Monterey.

Elsewhere in the tropics
It's September, the most active month for hurricane activity in the Northern Hemisphere. There's every indication that the 2009 Atlantic hurricane season will have an active first half of September, since SSTs are 0.5 - 1.0°C above average, wind shear is near average, and the African monsoon is sending a long parade of African waves spinning off the coast of Africa. An IR satellite image from noon today shows this activity well (Figure 2). We can see a line-up of five African waves stretching from the Lesser Antilles to eastern Africa. The GFS model develops the waves numbered "2" and "3" into tropical depressions next week, and the waves labeled "1" and "4" also have a chance to develop into tropical depressions, as well. The wave labeled "1" is mentioned on NHC's Tropical Weather Outlook as having a low (less than 30%) chance of developing into a tropical depression by Thursday. This wave is under a moderate 10 - 15 knots of wind shear, and is over sufficiently warm waters (27 - 28°C) that some development may occur this week. The wave is far enough north that it will be hampered by dry air from the Sahara Desert.

California fire webcams
As I discussed in this morning's post, you can use our wundermap for Los Angeles with the fire layer turned on to see where the fire and smoke are located, and track the temperatures and winds during today's air pollution event. We also have two webcams with views of the fire: Altadena and Tujunga.

Jeff Masters
Backing Down (Fotoguy77)
Part of the massive Station Fire backs down toward Sunland, Ca in this shot taken around 1am. The fire has burned through over 122,000 acres and killed two.
Backing Down
getting out (Fotoguy77)
This fire Chief from El Dorado County in Northern California is chased out of Aliso Canyon by a wall of flames. This was in the Acton area just off the 14 Freeway.
getting out
Categories: Hurricane
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1451. Brillig 12:41 AM GMT del 02 Settembre 2009    
Quoting cybergrump:
The latest center fix from HH seems to be moving more west then north..


Yeah, after the center found the convection, I bet the path starts being more predictable.
Member Since: Giugno 23, 2006 Posts: 20 Comments: 398
1452. Dakster 12:42 AM GMT del 02 Settembre 2009    
Quoting Patrap:


Why sure,,just scroll back a Day or two..


Thanks. ;-)
Member Since: Marzo 10, 2006 Posts: 0 Comments: 4938
1453. WPBHurricane05 12:42 AM GMT del 02 Settembre 2009    
Quoting stormpetrol:
The more intense & strong , the more poleward movement is the general concensus, but not necessarily the rule, there are exceptions, Dean in 2007 comes to mind as an example.


Ike last year, too.

REPEATING THE 1100 PM AST POSITION...21.2 N...70.9 W. MOVEMENT
TOWARD...WEST-SOUTHWEST
NEAR 15 MPH. MAXIMUM SUSTAINED WINDS...135
MPH.
MINIMUM CENTRAL PRESSURE...947 MB.
Member Since: Luglio 31, 2006 Posts: 56 Comments: 7929
1454. AllyBama 12:42 AM GMT del 02 Settembre 2009    
Hey, will40 - you got mail my friend!..so glad to see you on here.
Member Since: Agosto 3, 2006 Posts: 131 Comments: 20499
1455. DaytonaBeachWatcher 12:42 AM GMT del 02 Settembre 2009    
Quoting stormpetrol:
The more intense & strong , the more poleward movement is the general concensus, but not necessarily the rule, there are exceptions, Dean in 2007 comes to mind as an example.


and andrew
Member Since: Giugno 29, 2007 Posts: 0 Comments: 1125
1456. AllStar17 12:42 AM GMT del 02 Settembre 2009    
Erika's future continues to be very uncertain to say the least.

Member Since: Giugno 29, 2009 Posts: 13 Comments: 5135
1457. Cavin Rawlins 12:42 AM GMT del 02 Settembre 2009    
Quoting stormpetrol:
The more intense & strong , the more poleward movement is the general concensus, but not necessarily the rule, there are exceptions, Dean in 2007 comes to mind as an example.


Dean and Felix had no choice 2007's high extended to 300 mb.

Also Karen would have made it west too.
Member Since: Luglio 24, 2005 Posts: 407 Comments: 19076
1458. cjswilmingtoneye 12:42 AM GMT del 02 Settembre 2009    
Quoting Stormchaser2007:


Yes but Dean has a monster ridge. The exact opposite of this year.
Nice observation, and Dean was also quite a bit further south than Mrs. Erkia
Member Since: Giugno 1, 2009 Posts: 0 Comments: 107
1459. nash28 12:42 AM GMT del 02 Settembre 2009    
Dean continued due west because of the massive AB High which bridged with the SE CONUS heat ridge. Remember how friggin hot and dry it was throughout the SE that summer?
Member Since: Luglio 11, 2005 Posts: 190 Comments: 16972
1461. Patrap 12:43 AM GMT del 02 Settembre 2009    
TS Erika RGB Blue Image

Member Since: Luglio 3, 2005 Posts: 371 Comments: 111577
1462. Bordonaro 12:43 AM GMT del 02 Settembre 2009    
Quoting Dakster:


All that rum she is drinking, hanging out in the Western Caribbean... A stalling storm can do that, the convection may have finally found its way to being centered over the LLC. I would like to see a quickscat pass over a still visibile image.

The latest QuikSAT I saw has 50KT winds @0023hrs, the last one before that was 55KT at about 2342hrs
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1463. WPBHurricane05 12:44 AM GMT del 02 Settembre 2009    
Member Since: Luglio 31, 2006 Posts: 56 Comments: 7929
1464. canesrule1 12:44 AM GMT del 02 Settembre 2009    
Since Erika is over a conducive environment for development it will probably become a hurricane soon because it is not moving.
1465. bystander 12:44 AM GMT del 02 Settembre 2009    
Quoting danieltoye:

Hi Everyone haven't posted in a year or so but I live on Fort Lauderdale Beach.

From the NHC viewpoint it would be best if Erica develops quickly and would likely move more NW away from Eastern US. My fear is that if Erica remains weak it would likely move in a more westward motion and be in a position threaten Florida or the Carolinas. The waters are very warm and high heat content. The US biggest threats hurricanes that pop up close to the coast (within 700 miles of the coast) rather than the typical Cape Verde storms.


Did somebody move georgia again?
Member Since: Luglio 24, 2007 Posts: 0 Comments: 201
1467. centex 12:44 AM GMT del 02 Settembre 2009    
Quoting youngw3ath3rman:
the nhc is trying to keep us from knowing something!
Conspiracy theorist a new type of caster.
Member Since: Agosto 10, 2007 Posts: 0 Comments: 2856
1468. antonio28 12:44 AM GMT del 02 Settembre 2009    
Quoting cybergrump:
The latest center fix from HH seems to be moving more west then north..


Also Dpass show it south of 17N not looking good.
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1469. Stormchaser2007 12:44 AM GMT del 02 Settembre 2009    
Member Since: Giugno 9, 2007 Posts: 4 Comments: 15248
1470. JupiterFL 12:44 AM GMT del 02 Settembre 2009    
Quoting Dakster:


All that rum she is drinking, hanging out in the Western Caribbean... A stalling storm can do that, the convection may have finally found its way to being centered over the LLC. I would like to see a quickscat pass over a still visibile image.


That's funny because my experience has been that copius amounts of Rum make women shrink.
Member Since: Agosto 10, 2005 Posts: 0 Comments: 2146
1471. Cavin Rawlins 12:44 AM GMT del 02 Settembre 2009    
Kinda band for the islands if Erika intensifies tonight

Antigua storm watcher

During the past couple hours, there's been a massive burst of very cold top convection right over the center. This flare could be a cyclic event, in anycase, if the convection is persistent, it could be indicative that Erika is trying to intensify. If this is the case, it also means the wind field will become more symmetric and would likely expand as the storm gets stronger. It all depends on whether the convection will stay or weakens or even sheared off to the east again. If the convection remains vigorous for the next few hours, the NHC may consider raising Erika's intensity. Another ReconAir will be enroute to attempt another fix and give a better estimate tonight.
Member Since: Luglio 24, 2005 Posts: 407 Comments: 19076
1472. K8eCane 12:45 AM GMT del 02 Settembre 2009    
Quoting willdunc79:
K8eCane I'm from fayetteville in SouthEast NC where are you at/from in NC?


hey sorry
got busy
i'm from Wilmington
Member Since: Aprile 26, 2006 Posts: 5 Comments: 2375
1473. HurricaneRoman 12:45 AM GMT del 02 Settembre 2009    
Quoting Dakster:


All that rum she is drinking, hanging out in the Western Caribbean... A stalling storm can do that, the convection may have finally found its way to being centered over the LLC. I would like to see a quickscat pass over a still visibile image.



hahahahaha! so it appears Erika is a wild one xD

So is there a strong trough forecasted to weaken the ridge? as strong as the one with bill?
Member Since: Febbraio 25, 2006 Posts: 2 Comments: 958
1474. Stormchaser2007 12:45 AM GMT del 02 Settembre 2009    
Quoting Patrap:
TS Erika RGB Blue Image



Rather old image Pat.
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1476. AllStar17 12:45 AM GMT del 02 Settembre 2009    
My heart goes out to all those effected by the "Station Fire" in LA, as well as those in the path of the dangerous Jimena.
Member Since: Giugno 29, 2009 Posts: 13 Comments: 5135
1477. Patrap 12:45 AM GMT del 02 Settembre 2009    
TS Erika Floater - JSL Color Infrared Loop

Be sure to check the TFP Box and the MSLP box too.
Member Since: Luglio 3, 2005 Posts: 371 Comments: 111577
1478. jipmg 12:45 AM GMT del 02 Settembre 2009    
Quoting antonio28:


Also Dpass show it south of 17N not looking good.


lets not forget its nearly stationary..
1479. bajelayman2 12:46 AM GMT del 02 Settembre 2009    
Now, just why is that pic just soooo cool!?
Member Since: Agosto 13, 2007 Posts: 0 Comments: 468
1480. foggymyst 12:46 AM GMT del 02 Settembre 2009    
Good Evening to all. What is the thinking on Erika..TIA
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1481. K8eCane 12:46 AM GMT del 02 Settembre 2009    
hey there cjs also
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1482. tedolphin 12:46 AM GMT del 02 Settembre 2009    
*blows a lung-full desperately to the East in vein*
After witnessing George in '04 and dealing with the aftermath of Wilma in '05, the one thing I know for sure is that I never want to re-live that experience! It's unnerving watching all of your hard work get washed away in a mater of a few hours. Not to mention having to further the destruction yourself before you can even consider picking up the pieces to rebuild. Let's hope another year goes by without a devastating landfall.
I had a dream...er, nightmare last night...not good.
1483. Cavin Rawlins 12:47 AM GMT del 02 Settembre 2009    
Where's WeatherStudent? I expected him to be here.
Member Since: Luglio 24, 2005 Posts: 407 Comments: 19076
1484. canesrule1 12:47 AM GMT del 02 Settembre 2009    
Quoting Weather456:
Where's WeatherStudent? I expected him to be here.
lol, i agree
1486. unf97 12:47 AM GMT del 02 Settembre 2009    
Good evening WU community!

Well, we certainly will be busy these next coming days on this blog. Erika has slowed to a near crawl this eveening, and the deep convection has apparently finally caught up to the COC. Tha anticyclone definitely is aiding the cyclone in fighting off the shear which had been inhibiting it earlier today. The system is ventilating fairly decent right now obviously. Erika is definitely looking impressive this evening. The 11 p.m. advisory from the boys at NHC will really be interesting.
Member Since: Settembre 25, 2007 Posts: 0 Comments: 1193
1488. AllStar17 12:47 AM GMT del 02 Settembre 2009    
Quoting Weather456:
Where's WeatherStudent? I expected him to be here.


Preparing for Erika...LOL.
Member Since: Giugno 29, 2009 Posts: 13 Comments: 5135
1489. Stormchaser2007 12:48 AM GMT del 02 Settembre 2009    
Quoting bajelayman2:
Now, just why is that pic just soooo cool!?


What image?
Member Since: Giugno 9, 2007 Posts: 4 Comments: 15248
1490. MrstormX 12:48 AM GMT del 02 Settembre 2009    

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1491. Patrap 12:48 AM GMT del 02 Settembre 2009    
Quoting Weather456:
Where's WeatherStudent? I expected him to be here.


LOL..Ive been waiting for Hours for that one.

WS has been er,..replaced by more RAM in the server..permanently.
Member Since: Luglio 3, 2005 Posts: 371 Comments: 111577
1492. cajunkid 12:48 AM GMT del 02 Settembre 2009    
this site is awesome Link
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1493. K8eCane 12:48 AM GMT del 02 Settembre 2009    
yep
nervous about this one lookin at Official Track
Member Since: Aprile 26, 2006 Posts: 5 Comments: 2375
1494. Chucktown 12:48 AM GMT del 02 Settembre 2009    
Quoting canesrule1:
Since Erika is over a conducive environment for development it will probably become a hurricane soon because it is not moving.


Upwelling becomes a concern when storms move this slow. Another reason why Erika may not intensify rapidly.
Member Since: Agosto 27, 2006 Posts: 0 Comments: 1390
1495. Drakoen 12:48 AM GMT del 02 Settembre 2009    
Ericka continues to get better organized under marginally conducive upper level winds.
Member Since: Ottobre 28, 2006 Posts: 57 Comments: 29010
1496. nrtiwlnvragn 12:48 AM GMT del 02 Settembre 2009    
Erika 00Z SHIPS

Prob of RI for 25 kt RI threshold= 40% is 3.3 times the sample mean(12.3%)
Prob of RI for 30 kt RI threshold= 26% is 3.2 times the sample mean( 8.0%)
Prob of RI for 35 kt RI threshold= 21% is 4.4 times the sample mean( 4.8%)

Member Since: Settembre 23, 2005 Posts: 11 Comments: 8937
1497. AllStar17 12:49 AM GMT del 02 Settembre 2009    
Well I am going...not to bed...but to do some stuff and will check in early tomorrow morning on Erika, Jimena, wildfire, and anything else brewing.

Member Since: Giugno 29, 2009 Posts: 13 Comments: 5135
1498. Stormchaser2007 12:49 AM GMT del 02 Settembre 2009    
Quoting Weather456:
Where's WeatherStudent? I expected him to be here.


Probably revived an IP ban for plagiarizing.
Member Since: Giugno 9, 2007 Posts: 4 Comments: 15248
1500. bystander 12:49 AM GMT del 02 Settembre 2009    
Quoting StSimonsIslandGAGuy:
The last major to hit Georgia, bystander:



Thanks. That is my point. It is not impossible.
Member Since: Luglio 24, 2007 Posts: 0 Comments: 201
1501. boatmanoki 12:49 AM GMT del 02 Settembre 2009    
Quoting K8eCane:
hey there cjs also
just south of u in Oak Island

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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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